scholarly journals Experimental Studies on Natural Convection Open and Closed Solar Drying Using External Reflector

2021 ◽  
Author(s):  
Abd Elnaby Kabeel ◽  
Paul Durai Leon Dharmadurai ◽  
Sathiyaseelan Vasanthaseelan ◽  
Prof. Dr. Ravishankar Sathyamurthy ◽  
Bharathwaaj Ramani ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Natural Convection ◽  
Removal Rate ◽  
Experimental Studies ◽  
Heat Energy ◽  
Moisture Removal ◽  
Solar Drying ◽  
Solar Dryer ◽  
Drying Efficiency ◽  
Food Dryer

Abstract This work presents the experimental investigation on a solar food dryer equipped with external reflectors to enhance the rate of drying efficiency by removing the moisture content available in the anchovy fish. A comparison on conventional open solar drying is carried out to assess the parameters such as drying efficiency, moisture removal rate, and heat energy required for drying the anchovy fish using the modified solar dryer using natural convection technique. The physical examination results on the dried products proved that using modified solar dryer, the dried product are free from insects, dust. Also, it is found that the loss of colour from the product is minimum while compared to conventional open solar drying. The results showed that the thermal efficiency of dryer 1 and dryer 2 are comparatively higher as compared to that of conventional open solar drying and found as 16.73 and 19.34 % respectively.

scholarly journals Effects of Blanching and Natural Convection Solar Drying on Quality Characteristics of Red Pepper (Capsicum annuum L.)

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
James Owusu-Kwarteng ◽  
Francis K. K. Kori ◽  
Fortune Akabanda
Keyword(s):  
Natural Convection ◽  
Quality Characteristics ◽  
Red Pepper ◽  
Plain Water ◽  
Drying Methods ◽  
Solar Drying ◽  
Drying Time ◽  
Sun Drying ◽  
Overall Acceptability ◽  
Solar Dryer

The objective of this work was to determine the effects of blanching and two drying methods, open-sun drying and natural convection solar drying, on the quality characteristics of red pepper. A 2 × 3 factorial design with experimental factors as 2 drying methods (open-sun drying and use of solar dryer) and 3 levels of pepper blanching (unblanched, blanched in plain water, and blanched in 2% NaCl) was conducted. Dried pepper samples were analysed for chemical composition, microbial load, and consumer sensory acceptability. Blanching of pepper in 2% NaCl solution followed by drying in a natural convection solar dryer reduced drying time by 15 hours. Similarly, a combination of blanching and drying in the solar dryer improved microbial quality of dried pepper. However, blanching and drying processes resulted in reduction in nutrients such as vitamin C and minerals content of pepper. Blanching followed by drying in natural convection solar dryer had the highest consumer acceptability scores for colour and overall acceptability, while texture and aroma were not significantly (p>0.05) affected by the different treatments. Therefore, natural convection solar dryer can be used to dry pepper with acceptable microbial and sensory qualities, as an alternative to open-sun drying.

scholarly journals Comparative study of different drying methods regard to the phenols and flavonoids content of dried Citrus aurantium L. leaves

2021 ◽  
Author(s):  
Geovanni Hernandez Galvez ◽  
Margarita Castillo Téllez ◽  
Jorge de Jesús Chan González ◽  
Francisca Méndez Morales ◽  
Damianys Almenares López ◽  
...  
Keyword(s):  
Natural Convection ◽  
Forced Convection ◽  
Design Methodology ◽  
Total Phenol ◽  
Drying Methods ◽  
Total Flavonoids ◽  
Citrus Aurantium ◽  
Solar Drying ◽  
Solar Dryer ◽  
Total Flavonoids Content

Objective: To determine the effects of different thermal drying technologies on the total phenol and flavonoid contents (TPC) and total flavonoids (TFC) in sour orange (Citrus aurantium L.) leaves. Design/methodology/approach: Solar drying was carried out in outdoor sunny conditions using two direct solar dryers; one with natural convection, the other with forced convection. The total phenol and flavonoid contents in gallic acid equivalents (GAE) and quercetin (Q), respectively, of ethanolic extracts of C. aurantium were assessed with spectrophotometric techniques. Results: The results demonstrated maximum phenol values for the direct natural convection solar dryer (161.4 mg EAG/g MS) and minimum values for shade drying (61.43 mg EAG/g MS). As for flavonoids, the highest values were obtained in the direct forced convection solar dryer (32.22 ± 1.6 mg EQ/g MS), while the lowest was registered in the open air sun (11.72 mg EQ/g MS). Conclusions: Direct solar dryers are technologies effective for maintaining the phenols and total flavonoids content in dried leaves of C. aurantium.  

Experimental Investigation of Drying Cucumber in a Double Slope Solar Dryer Under Natural Convection and Open Sun Drying

2021 ◽  
pp. 41-52
Author(s):  
E. Elavarasan ◽  
Sendhil Kumar Natarajan ◽  
Anagh S. Bhanu ◽  
A. Anandu ◽  
M. H. Senin
Keyword(s):  
Experimental Investigation ◽  
Natural Convection ◽  
Sun Drying ◽  
Solar Dryer

scholarly journals Effect of cover design on moisture removal rate of a cabinet type solar dryer for food drying application

2019 ◽  
Vol 160 ◽  
pp. 769-776 ◽  
Author(s):  
Majedul Islam ◽  
Md Imrul Islam ◽  
Mehedi Tusar ◽  
Amir Hamza Limon
Keyword(s):  
Removal Rate ◽  
Moisture Removal ◽  
Solar Dryer ◽  
Cover Design

Application of Generalized Regression Neural Network in Predicting the Performance of Natural Convection Solar Dryer

2019 ◽  
Vol 142 (3) ◽  
Author(s):  
M. Sridharan
Keyword(s):  
Neural Network ◽  
Natural Convection ◽  
Network Architecture ◽  
Experimental Studies ◽  
Generalized Regression Neural Network ◽  
Atmospheric Conditions ◽  
Time Duration ◽  
Transient Nature ◽  
Solar Dryer ◽  
Generalized Regression

Abstract The performance evaluation of a natural convection solar dryer is a complex one because of the transient and non-linear nature of atmospheric conditions. In this comparative study, a smart neural network -based tool was developed for estimating the performance of such a transient nature solar dryer. For this purpose, a series of experimental studies are conducted through four successive days and compared with the generalized regression neural network (GRNN) modeling. GRNN architecture proposed in this study consists of three inputs (time duration, irradiance, and ambient temperature) and four outputs (drying chamber temperature, the mass of moisture removed, drying rate, and dryer efficiency). Such generalized regression neural network architecture was trained, tested, and validated with real-time experimental variable data sets. The results of the GRNN model are in good agreement with experimental results. The overall accuracy of the proposed GRNN model in predicting the performance is 96.29%.

scholarly journals Experimental Analysis of Single Glazing, Double Glazing and Triple Pass Solar Dryer

2020 ◽  
pp. 70-73
Keyword(s):  
Moisture Content ◽  
Window Glass ◽  
Initial Moisture Content ◽  
Solar Drying ◽  
Average Value ◽  
Solar Dryer ◽  
Collector Efficiency ◽  
Drying System ◽  
Time Required ◽  
Drying Efficiency

Adjustable Multi glazing solar drying system is designed and fabricated for experimental study. The arrangement is made in the present model such that it can be wok as a single glazing, double glazing and multi-glazing solar dryer by adjusting the plain window glass (Glazing). The performance analysis and comparison of Single glazing (SGSD), double glazing (DGSD) and Triple pass solar drying system (TPSD) have been conducted by using red chilli. The performance curves show the effect of solar intensity on the collector efficiency, drying efficiency and pick-up efficiency of solar drying system. The collector efficiency of TPSD increased by 28.8% and 53% as compared to DGSD & SGSD respectively at average value of solar radiation 674.4 W/m² at 26.90 gm per second of air mass. The initial moisture content in red chili was measured and found 78.8 (wb) reduced to minimum moisture content 9.8% (wb). It could be concluded that, the time required to dry the red chilli in TPSD is minimum as compared to SGSD and DGSD.

scholarly journals Design and development of natural convective solar dryer

2021 ◽  
Vol 11 (4) ◽  
pp. 144-150
Author(s):  
Baibhaw Kumar ◽  
L. Gábor Szepesi ◽  
Zoltán Szamosi
Keyword(s):  
Heat Source ◽  
Developing Nations ◽  
External Heat ◽  
Agricultural Products ◽  
Wood Chips ◽  
Solar Drying ◽  
External Heat Source ◽  
Solar Dryer ◽  
Drying Behavior ◽  
Drying Efficiency

Solar drying has emerged as a potential drying solution for agricultural products in many developing nations. The drying behavior of the product to be dried depends on many parameters of the dryer. A box-type natural convective solar dryer was developed to analyze the drying performance of Wood chips. Experiments revealed promising drying results with drying efficiency. The design of the dryer could further be enhanced by hybridization with an external heat source.

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